Add a variant of the init_request function which does not pass a hctx_idx
arg.

This is important for shared sbitmap support, as it needs to be ensured for
introducing shared static rqs that the LLDD cannot think that requests
are associated with a specific HW queue.

Signed-off-by: John Garry <redacted>
---
 block/blk-mq.c         | 15 ++++++++++-----
 include/linux/blk-mq.h |  7 +++++++
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index f14cc2705f9b..4d6723cfa582 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c

@@ -2427,13 +2427,15 @@ struct blk_mq_tags *blk_mq_alloc_rq_map(struct blk_mq_tag_set *set,
 static int blk_mq_init_request(struct blk_mq_tag_set *set, struct request *rq,
 			       unsigned int hctx_idx, int node)
 {
-	int ret;
+	int ret = 0;
 
-	if (set->ops->init_request) {
+	if (set->ops->init_request)
 		ret = set->ops->init_request(set, rq, hctx_idx, node);
-		if (ret)
-			return ret;
-	}
+	else if (set->ops->init_request_no_hctx)
+		ret = set->ops->init_request_no_hctx(set, rq, node);